A curated, deployable open-source tech stack a venture firm can self-host instead of paying $85k–$280k/yr in SaaS rent.
A typical 15-person VC could spend up to $85,000/year on Affinity + Visible + Slack + Zoom + Calendly + Airtable + Tableau + Notion + a per-deal VDR.
A 50-person firm spends might spend closer to $278,000/year on the many tools that a firm of that size would need, at the larger, enterprise tier.
Every line item now has a credible open-source alternative; the friction has historically been the willingness to futz with it -- e.g. integration and deploy ergonomics, not intellectual ability or technical skill.
This repo is the integration-and-deploy-ergonomics layer. Each tool under core/ ships with a thin deploy wrapper (Dockerfile, Compose snippet, Railway / Fly template, env example) so a competent team can stand up the full stack in a long weekend instead of a long quarter.
Setup and management available on request from The Lossless Group
| Tool | Replaces | Savings (15-person firm) |
|---|---|---|
| twenty-crm — modern open-source CRM, 45k+ GitHub stars, native AI/MCP | Affinity ($33k/yr) or Salesforce FSC ($97k+/yr) | $20k–$130k/yr |
| papermark — only fully open-source VDR; unlimited rooms, page-by-page analytics, custom domains | DealRoom ($12k–$15k/yr), ShareVault ($1.5k–$5k+/deal) | $11k–$49k/yr |
| plunk — open-source email platform; transactional sends, marketing campaigns, and automation workflows in one, AWS SES backend, Docker-deployable, AGPL-3.0 | Mailchimp ($1.6k–$4.2k/yr), Kit/ConvertKit ($1.1k–$2.4k/yr), SendGrid/Resend (transactional) | $1k–$4k/yr |
| postiz-app — open-source social media scheduling; one composer → many channels (X, LinkedIn, Instagram, Facebook, TikTok, YouTube, Mastodon, Bluesky), AI copy/design, per-post analytics, team collaboration, unlimited users, AGPL-3.0 | Hootsuite ($1.2k–$3k/yr), Buffer ($2.4k/yr), Sprout Social ($199+/seat/mo) | $1.2k–$5k/yr |
| karakeep — self-hostable bookmark-everything app (links, notes, images) with AI-based automatic tagging and full-text search; multi-user with an admin panel for account creation and role management, AGPL-3.0 | Raindrop.io Pro ($36/yr), Pocket/Instapaper Premium ($36–$60/yr) | $540–$900/yr (15 users) |
Cal.com (scheduling), Mattermost (team chat), Jitsi Meet (video), Metabase (BI), NocoDB (no-code DB), BookStack (knowledge base). Each will land as its own submodule under core/ with the same deploy-wrapper discipline. See the full catalogue below.
self-host-stack/
core/ ← the tools we've chosen and stand behind (submodules)
twenty-crm/ → lossless-group/twenty-crm (Affinity alternative)
papermark/ → lossless-group/papermark (DealRoom / ShareVault alternative)
plunk/ → useplunk/plunk (Mailchimp / Kit / SendGrid alternative)
postiz-app/ → gitroomhq/postiz-app (Hootsuite / Buffer / Sprout alternative)
karakeep/ → karakeep-app/karakeep (Raindrop.io / Pocket alternative)
… more to come
studies/ ← alternatives we explored but didn't ship (submodules)
client-stacks/ ← per-firm deployed instances (gitignored — operational, not public)
core/is the marketing surface. Each entry is a thin deploy wrapper around an upstream OSS tool, ideally referencing the official upstream image rather than vendoring it. Where deploy-side modifications are needed, the submodule points at a fork underlossless-group/so changes can layer without polluting upstream (e.g.twenty-crm,papermark); where none are needed yet, it pins the official upstream directly (e.g.plunk→useplunk/plunk).studies/is the "we looked at these and chose otherwise" layer. Pinned-upstream submodules for prior art we read but didn't ship.client-stacks/is operational. Each subdir is one firm's actual deployment, with real env files and real database connection strings. Intentionally gitignored — these are not marketing material and they contain secrets.
What follows is the full vendor-by-vendor analysis driving the core/ selections. Each table maps a category of VC tooling from the proprietary side to the open-source self-hosted side, with annual savings math underneath.
Specialized relationship-management platforms for deal flow tracking, LP management, portfolio monitoring, and relationship intelligence via email/calendar mining.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Affinity CRM | $167–$225/user/month (~$33,000/yr for 15 users)1 | TwentyCRM — Modern open-source CRM, 45k+ GitHub stars, native AI/MCP integration | $0 |
| Salesforce Financial Services Cloud | $325–$750/user/month + $50k–$250k implementation23 | (see TwentyCRM above) — no OSS option genuinely matches FSC's private-markets workflow at this tier; TwentyCRM + the MCP/AI layer is the closest functional replacement and dramatically cheaper | $0 |
| DealCloud | ~$85,000/yr enterprise4 | (see TwentyCRM above) — same logic as FSC; relationship-intelligence flow lives in Twenty + your own AI orchestration on top, not in DealCloud's pipeline UI | $0 |
| 4Degrees | ~$100/user/month4 | (see TwentyCRM above) | $0 |
Annual savings (15-person firm): $31k–$33k vs. Affinity; up to $130k vs. Salesforce FSC.
Secure, permissioned document repositories for due diligence, with audit trails, Q&A modules, and granular access controls.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| DealRoom Pipeline | $12,000/yr (2GB, unlimited users)5 | Papermark — Only fully open-source VDR; unlimited data rooms, page-by-page analytics, custom domains | $0 |
| DealRoom Diligence | $15,000/yr buy/sell-side5 | ONLYOFFICE DocSpace — GDPR-compliant, room-based storage, collaborative editing, Docker deployable | $0 |
| ShareVault | $1,500–$5,000+ per deal (3 months)6 | Nextcloud + Secure Share — Self-hosted file sync with enterprise audit logging and access controls | $0 |
Annual savings (8–10 deals/year): $11k–$49k in VDR fees alone.
Platforms that automate KPI collection from portfolio companies, generate LP quarterly reports, and surface portfolio health dashboards.
A note on what doesn't belong here. A casual search for "open source portfolio tracker" surfaces Ghostfolio, Wealthfolio, Rotki, and similar projects — these are personal stock and crypto portfolio trackers. They do not model portfolio companies, KPI collection, LP quarterly reporting, capital-call accounting, or ownership-stake math. We deliberately do not list them. The honest OSS answer for a VC firm is a custom build.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Visible.vc | $149/mo (15 companies) → $349/mo (40 companies)7 | Custom NocoDB or Baserow build — Portfolio companies as a base, KPIs as a related table, quarterly snapshots as time-series rows. 2–5 days of setup; fits firm's actual reporting cadence; survives metric pivots; joins against the CRM and VDR without integration licenses. | $0 |
| Archstone | $297/mo Core (15 portfolio + 25 LPs)7 | (see above — same custom build) | $0 |
| Carta Portfolio | $280–$77,000/yr by portfolio size4 | (see above — same custom build) | $0 |
Annual savings (20 portfolio companies): $3k–$4k vs. Visible.vc Standard; $8k–$13k at enterprise scale. Setup labor is real but one-time; the alternative pays setup costs and SaaS rent forever.
Real-time messaging platforms for deal discussions, channel-organized portfolio updates, and LP communications.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Slack Pro | $7.25/user/month (billed annually)89 | Mattermost — Self-hosted Slack clone; strong encryption, extensive plugin system, mobile apps | $0 |
| Slack Business+ | $12.50/user/month9 | Rocket.Chat — MIT-licensed, omnichannel comms, video calls, federation, fully brandable | $0 |
| Slack Pro + AI | $22.25/user/month8 | Zulip — Thread-centric chat with unique conversation model; self-hosted or cloud | $0 |
| Microsoft Teams | $4–$12.50/user/month (M365 bundle)8 | Element (Matrix) — Fully end-to-end encrypted messaging on federated Matrix protocol | $0 |
Annual savings: $1.2k–$3.9k for 15-person team; $3.1k–$6.3k for 50-person firm.
Outbound, firm-to-audience email: LP quarterly update sends, founder-network newsletters, fund announcements, and the transactional notices the rest of the stack generates (data-room access alerts, scheduling confirmations). A different lane than the internal chat above — this is one-to-many email, not team-to-team messaging.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Mailchimp Standard | $20/mo (500 contacts), scaling to ~$135/mo at 10k contacts and $270/mo at 25k10 | Plunk — Open-source email platform that unifies transactional, campaign, and automation sends; visual no-code workflow builder, segments, contact management, custom domains with DKIM/SPF, AWS SES backend, Docker-deployable | $0 |
| Mailchimp Premium | $350/mo flat to 10k contacts, $620/mo at 25k10 | (see Plunk above) | $0 |
| Kit (ConvertKit) Creator | $39/mo (1k subs) → $89/mo (5k) → $199/mo (25k)11 | (see Plunk above) — same campaign + automation surface for creator-style newsletters | $0 |
| SendGrid / Resend / Mailgun | per-email transactional pricing; commonly $80–$500+/mo at firm volume | (see Plunk above) — Plunk covers the transactional lane too, so one tool replaces both the marketing ESP and the transactional API | $0 |
Annual savings (15-person firm): $1.1k–$4.2k depending on list size and tier replaced — Kit Creator ($1.1k–$2.4k/yr), Mailchimp Standard ($1.6k/yr), or Mailchimp Premium ($4.2k/yr). Plunk is AGPL-3.0 and self-hosts on AWS SES at ~$0.10 per 1,000 emails12, so a firm sending 50k emails/month pays under $5/month in delivery — the licensing line goes to $0.
One composer that publishes to every channel a firm maintains — LinkedIn thought leadership, X/Twitter, portfolio-news announcements, recruiting posts — with per-channel previews, scheduling, AI-assisted copy/design, and per-post analytics in one dashboard. The SaaS incumbents here punish you on the two axes a firm scales fastest: seats and connected accounts.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Hootsuite Professional | $99/mo (1 user, 10 social accounts)13 | Postiz — Open-source command center for social: write once and publish to X, LinkedIn, Instagram, Facebook, TikTok, YouTube, Mastodon, Bluesky and more; AI copy + Canva-style design, official-API analytics, team collaboration, unlimited users, Docker-deployable | $0 |
| Hootsuite Team | $249/mo (3 users, 20 social accounts)13 | (see Postiz above) | $0 |
| Buffer Team | $199/mo (25 channels, 6 users); $5/channel/mo entry tier14 | (see Postiz above) — same write-once-publish-everywhere surface without per-channel metering | $0 |
| Sprout Social Standard | from $199/user/month14 | (see Postiz above) — per-seat pricing is what makes Sprout escalate; self-hosting removes the seat tax entirely | $0 |
Annual savings (15-person firm): $1.2k–$3k/yr replacing Hootsuite (Professional $1.2k/yr → Team $3k/yr) or Buffer Team ($2.4k/yr); materially more if displacing Sprout Social, where every additional seat is another ~$2.4k/yr. Postiz is AGPL-3.0 with unlimited users self-hosted, so neither seats nor connected accounts inflate the bill.
Video platforms for investor meetings, portfolio board meetings, LP annual gatherings, and internal deal review sessions.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Zoom Business | $18.33/user/month (full Workplace bundle)15 | Jitsi Meet — Browser-based (no install), up to 1080p, 2–75 participants, complete data control | $0 |
| Zoom Pro | $13.33/host/month + $5.99/mo Scheduler add-on15 | BigBlueButton — Whiteboard, breakout rooms, recording, collaboration | $0 |
Annual savings (15-person team): ~$2.5k–$3.3k net of infrastructure costs.
Scheduling automation that eliminates email back-and-forth for investor meetings and lets founders self-book partner time.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Calendly Standard | $10/user/month1617 | Cal.com — Open-source Calendly alternative; full source access, self-hostable, identical feature set | $0 |
| Calendly Teams | $16/user/month with routing/distribution16 | Easy!Appointments — Self-hosted scheduling with Google Calendar/CalDAV sync, provider mgmt, email notifications, API | $0 |
| Calendly Enterprise | From $15,000/yr (SAML SSO, advanced controls)15 | Cal.com (self-hosted Enterprise) — Full enterprise feature set including SSO, SCIM, audit logs | $0 |
| Doodle Business | ~$14.95/user/month (group find-a-time polls)18 | Rallly — Open-source Doodle alternative for group scheduling; modern Next.js, 10k+ GitHub stars. Different lane than Cal.com — covers IC scheduling, LP annual meeting coordination, partner offsites where 1:1 booking pages don't fit. | $0 |
Annual savings (15-person team): $1.3k–$4k vs. Teams or Enterprise tiers. Add ~$2.7k/yr if replacing Doodle Business at the same scale.
Relational, no-code database platforms (Airtable-shape) for custom deal pipelines, LP management dashboards, and investment committee workflows. This is the spreadsheet-with-superpowers lane — Notion-style hybrid docs-and-DB tools sit in Knowledge Management & Documentation instead, where AppFlowy is the natural OSS counterpart.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Airtable Team | $20/user/month19 | NocoDB — Turns any MySQL/PostgreSQL into an Airtable-like UI; 56k+ GitHub stars, auto-generated REST APIs, multiple views | $0 |
| Airtable Business | $45/user/month19 | Baserow — Fast even at unlimited rows; Airtable-style interface, automation, dashboards, API integration | $0 |
| Airtable Enterprise | Custom pricing (typically $60+/user/month) | Teable — Modern spreadsheet-style open-source alternative with strong relational capabilities and a polished UI | $0 |
Annual savings (15-person team): $3.6k–$8.1k depending on Airtable tier replaced.
BI platforms that transform portfolio data and fund metrics into interactive dashboards for partner review and LP presentations.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Tableau | $75/user/month (~$900/user/yr)2021 | Apache Superset — Born at Airbnb; 40+ DB connectors, drag-and-drop charts, SQL lab, CSS customization | $0 |
| Power BI | $10/user/month (Copilot requires Fabric F64+)22 | Metabase — Most beginner-friendly open-source BI; 90k+ company deployments, zero-SQL exploration | $0 |
| Qlik Sense | $20/user/month20 | Lightdash — Modern open-source BI with native dbt integration for data-team-forward firms | $0 |
| Sisense | $10,000+/yr custom pricing21 | Redash — Query-focused BI tool; great for SQL-comfortable analysts doing ad-hoc portfolio analysis | $0 |
Annual savings (10-person team): $7k–$7.8k vs. Tableau; $18.9k–$20.1k at 25 users.
Internal wikis and knowledge bases that preserve investment theses, due diligence frameworks, LP communications, and operating playbooks.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Confluence Standard | $5.42/user/month (Rovo AI included)23 | Outline — Modern, fast wiki with Slack-style editing, real-time collaboration, markdown-native | $0 |
| Confluence Premium | $10.42/user/month23 | BookStack — Self-hosted wiki with book/chapter/page hierarchy; ideal for organizing investment frameworks | $0 |
| Notion Plus | $10/user/month23 | Wiki.js — Modern open-source wiki; multiple auth options, beautiful UI, extensive plugin ecosystem | $0 |
| Notion Business | $20/user/month (includes AI)23 | AppFlowy — The most Notion-shaped OSS option; docs + databases + AI in one app, 60k+ GitHub stars, native desktop clients, self-hostable via AppFlowy Cloud. Also covers Airtable-style database use cases. | $0 |
Annual savings (20-person team): $1.3k–$4.2k; $4.1k–$10.8k for 50-person firm.
Tools for capturing and organizing web research, articles, and reference links gathered during deal sourcing and due diligence, with full-text search so nothing gets lost in browser bookmarks or Slack DMs.
| Proprietary Vendor | Pricing | Self-Hosted Alternative | Licensing Cost |
|---|---|---|---|
| Raindrop.io Pro | Karakeep — self-hostable bookmark-everything app (links, notes, images) with AI-based automatic tagging and full-text search; multi-user with admin-managed accounts, AGPL-3.0 | $0 | |
| Pocket / Instapaper Premium | ~$3–5/user/month24 | (see Karakeep above) | $0 |
Annual savings (15-person firm): $540–$900/yr.
Proprietary SaaS stack:
| Category | Cost |
|---|---|
| CRM (Affinity) | $33,000 |
| Portfolio Monitoring (Visible) | $4,200 |
| Communication (Slack Pro) | $1,300 |
| Video (Zoom Business) | $3,300 |
| Scheduling (Calendly Teams) | $2,900 |
| Database (Airtable Business) | $8,100 |
| Analytics (Tableau) | $13,500 |
| Knowledge Base (Notion Business) | $3,600 |
| VDR (per-deal) | $15,000 |
| Total | $84,900/yr |
Self-hosted open-source stack: $7,200–$12,000/yr (infrastructure only — VPS / cloud).
Annual savings: $72,900–$77,700 (86–91% reduction).
Proprietary SaaS stack:
| Category | Cost |
|---|---|
| CRM (Salesforce FSC + amortized implementation) | $140,000 |
| Portfolio Monitoring | $12,000 |
| Communication (Slack Business+) | $7,500 |
| Video (Zoom Business) | $11,000 |
| Scheduling (Calendly Teams) | $9,600 |
| Database (Airtable Business) | $27,000 |
| Analytics (Tableau) | $45,000 |
| Knowledge Base (Confluence Premium) | $6,250 |
| VDR | $20,000 |
| Total | $278,350/yr |
Self-hosted open-source stack: $18,000–$30,000/yr (dedicated servers / cloud).
Annual savings: $248,350–$260,350 (89–93% reduction).
Infrastructure requirements:
- VPS / cloud infrastructure: $50–$500/month depending on scale
- DevOps expertise for initial setup and maintenance
- Backup and disaster recovery planning
- Security hardening and SSL certificate management
Hidden benefits beyond cost:
- Data sovereignty — All sensitive deal data, LP information, and portfolio metrics remain under firm control
- Customization — Source-code access enables building VC-specific workflows impossible with SaaS
- Integration — Self-hosted tools can be deeply integrated without API rate limits or vendor restrictions
- Compliance — Easier to meet regulatory requirements with on-premises deployment
- No vendor lock-in — Migrate or modify without permission or data export fees
Trade-offs:
- Initial setup time investment (typically 40–120 hours for full stack)
- Ongoing maintenance burden (4–8 hours/month for updates and monitoring)
- Less polished UI in some cases compared to VC-specific SaaS
- Requires technical talent on team or fractional DevOps support
- lossless-group/twenty-crm — the CRM fork
- lossless-group/papermark — the VDR fork
- useplunk/plunk — the open-source email platform (pinned upstream; not yet forked under lossless-group/)
- gitroomhq/postiz-app — the social-media-scheduling platform (pinned upstream; not yet forked under lossless-group/)
- lossless-group/lossless-monorepo — the parent pseudomonorepo this lives inside as a submodule
- A logic behind Self-Hosted VC Stacks — the long-form thesis on lossless.group
Footnotes
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Social Media Management Pricing Comparison 2026: Hootsuite vs Buffer vs Sprout Social vs Agorapulse ↩ ↩2
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Calendly vs Zoom Scheduler: Honest Comparison (2026) ↩ ↩2 ↩3
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The Open-Source Airtable Alternative: APITable, nocodb & ... ↩ ↩2
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Tableau Alternatives: Visual Data Analysis Tools for Every Budget ↩ ↩2
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Best Tableau Alternatives in 2026: Matched to Why You're Looking ↩
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Confluence vs Notion Pricing 2026 | Features & Cost Comparison ↩ ↩2 ↩3 ↩4