Estimated monthly cost comparison — not just the headline price
Obsidian and Supabase overlap only partly, so check that both cover what you need before comparing cost.
Prices change often — confirm on the vendor's site before buying. Report incorrect pricing →
Quick Take
Obsidian has the lower estimated monthly cost (~60%)
Based on advertised price plus documented recurring fees, not your exact usage.
Best for Obsidian
Free local-first note-taking app with powerful linking. Personal use is free, but Sync ($4/mo) and P
Best for Supabase
Open-source Firebase alternative with Postgres database. Free tier is generous, then $25-$599/mo — b
Free local-first note-taking app with powerful linking. Personal use is free, bu...
Advertised
$0
/month
Estimated monthly cost
$16
/month (illustrative)
Obsidian Sync
Cross-device sync: $4/mo (annual) or $5/mo. Without it, you need your own sync solution (Dropbox, iC...
Obsidian Publish
Host notes as a website: $8/mo (annual) or $10/mo per site. Each additional site is another subscrip...
Commercial License
Using Obsidian for work with 2+ employees requires a Commercial license at $50/user/year ($4.17/user...
Open-source Firebase alternative with Postgres database. Free tier is generous, ...
Advertised
$0
/month
Estimated monthly cost
$40
/month (illustrative)
Database Size Overage
Pro plan includes 8GB database. Additional storage costs $0.125/GB/mo. A growing app at 50GB = $5.25...
Bandwidth Overage
Pro includes 250GB bandwidth/mo. Additional bandwidth: $0.09/GB. High-traffic APIs or real-time subs...
Edge Function Invocation Limits
Pro includes 2M edge function invocations/mo. Additional invocations at $2 per million. Serverless-h...
Obsidian advertises $0/mo. Supabase advertises $0/mo.
Obsidian has 3 documented hidden fees. Supabase has 3.
Obsidian confidence: 82%. Supabase confidence: 77%.
| Metric | Obsidian | Supabase | Winner |
|---|---|---|---|
| Advertised Price | $0/mo | $0/mo | — |
| Estimated Monthly Cost | $16/mo | $40/mo | Obsidian |
| Recurring Extra Fees | +$16/mo | +$40/mo | Obsidian |
| One-Time Costs | $0 | $0 | — |
| # Documented Fees | 3 | 3 | — |
| Pricing Tiers | 0 | 3 | — |
| Affiliate Program | None | None | — |
Obsidian advertises $0/mo and Supabase advertises $0/mo. Obsidian has 3 documented extra fees (recurring: +$16/mo), while Supabase has 3 (recurring: +$40/mo). On these illustrative assumptions, Obsidian has the lower estimated monthly cost (about 60% less). Your real cost depends on seats and usage — use the calculator for your numbers.
Obsidian has 3 documented extra fees: Obsidian Sync, Obsidian Publish, Commercial License. Recurring fees add roughly $16/mo on top of the $0/mo advertised price.
Supabase has 3 documented extra fees: Database Size Overage, Bandwidth Overage, Edge Function Invocation Limits. Recurring fees add roughly $40/mo on top of the $0/mo advertised price.
Choose Obsidian if: Free local-first note-taking app with powerful linking. Personal use is free, but Sync ($4/mo) and P. Choose Supabase if: Open-source Firebase alternative with Postgres database. Free tier is generous, then $25-$599/mo — b. The right choice depends on your team size, usage volume, and which features you need most.
This comparison is compiled from public vendor pricing pages and documentation. It uses illustrative assumptions (see "Cost Comparison Summary"), not your exact seats or usage, and vendor prices change often. Confirm current prices on each vendor's site, and use our calculator with your own usage for a closer estimate. Spotted an error? Email hello@trulycritic.com.
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