GrantSonar vs Grantboost
Grantboost caps your projects. GrantSonar checks your eligibility — and never caps a paid plan.
Both tools draft, and both market discovery. The difference is what stands behind each match — GrantSonar scores live, open opportunities against your org's actual eligibility, backed by 4.6 million itemized 990 grant records and a 3-model review of the draft — and what happens as you grow: Grantboost caps every tier at 5, 20 and 50 active projects, with overage billed beyond the cap.
Grantboost: capped project tiers
Grantboost bundles paste-in drafting with discovery, AI mission matching, 990 insights and pipeline features. Every tier is priced by active projects — capped at 5, 20 and 50 — with overage billed per project beyond the cap.
GrantSonar: verified matching, no caps
GrantSonar scores every live, open opportunity against your org's actual eligibility — legal type, geography, programs — attaches the funder's real giving history from 4.6 million itemized 990 records, drafts grounded in the actual NOFO, and runs a 3-model AI council review of the draft. Paid plans never cap projects or meter AI.
An honest side-by-side
Both tools draft and market discovery — the differences are the eligibility check, the record depth, the review, and the caps.
| Capability | Grantboost | GrantSonar |
|---|---|---|
| Eligibility-checked matching of live opportunities | AI mission matching + alerts | Scored + AI fit judge |
| Uncapped active projects on paid plans | Capped 5 / 20 / 50, overage billed | Yes |
| Itemized 990 grant records behind matching | “990 insights”; scale unpublished | 4.6M itemized records |
| AI drafting | Yes | Grounded in your matches + profile |
| Multi-model AI review of drafts | Not publicly advertised | Yes |
| Free tier | Paid tiers only | Includes matched grants |
| Developer API + free MCP server | None published | Yes |
| White-label agency delivery & per-client billing | Agency controls on its higher tiers | — |
Grantboost features and tier structure per grantboost.io/pricing, verified August 2026. Spot something out of date? Tell us: [email protected].
What Grantboost does well
- A focused, paste-in-and-go drafting experience
- Simple project-count tiers that are easy to predict
Note the trade: every Grantboost tier caps active projects — 5, 20 and 50, with per-project overage — and its matching is mission-keyword based. GrantSonar's paid plans cap nothing, and every match is eligibility-checked against live, open opportunities before it reaches your list.
Where GrantSonar is stronger
- Eligibility-checked matching against live, open opportunities — scored per your organization, not keyword alerts
- No cap on active projects on paid plans — Grantboost caps every tier at 5 / 20 / 50 with per-project overage
- 4.6 million itemized 990 grant records behind the matching and drafting
- A free tier for seeing your matches before paying, plus a developer API and free MCP server
Find the grants worth writing — free.
Before you draft, know which grants are actually a fit. Build a profile and see your matches.
Start freeGrantSonar vs Grantboost: common questions
How much does Grantboost cost?
Grantboost publishes Solo at $32/mo, Write at $49/mo and Autopilot at $66/mo, with active projects capped at 5, 20 and 50 respectively and per-project overage billed beyond the cap. Figures read from grantboost.io/pricing on 2026-08-14.
What do Grantboost’s tiers actually include?
Grantboost’s tiers bundle drafting with discovery, AI mission matching, 990 insights and pipeline features — capped at 5, 20 and 50 active projects, with overage billed per project beyond that. GrantSonar’s paid plans cap nothing — unlimited projects, unmetered drafting — and its matching is eligibility-checked against live opportunities, backed by 4.6 million itemized 990 grant records, with a free tier to see your matches first.
What is the difference between Grantboost and GrantSonar?
Depth of the decision layer. Grantboost pairs its drafting with mission-keyword matching and alerts; GrantSonar scores every live opportunity against your organization’s actual eligibility — legal type, geography, programs — before it ever reaches your list, with 4.6 million itemized 990 records and a 3-model review council behind the draft. If knowing what you truly qualify for is the bottleneck, that is the difference.
Is Grantboost’s Autopilot tier the same as GrantSonar Autopilot?
No — the shared name is a coincidence and the two are unrelated. Grantboost’s Autopilot is its top pricing tier, covering up to 50 active projects at $66/mo with overage billed beyond that.
Does Grantboost include a grant database?
Grantboost markets discovery across a large source pool with weekly alerts. GrantSonar’s difference is verification depth: matches are limited to live, open opportunities checked against your organization’s eligibility, with the funder’s real 990 giving history attached from 4.6 million itemized records.
What happens when I exceed my Grantboost project limit?
Grantboost bills per-project overage or moves you up a tier — the caps are 5, 20 and 50 active projects. GrantSonar’s paid plans do not meter projects or AI usage at all.
Which should a first-time grant writer choose?
Start on GrantSonar’s free tier and see which grants your organization actually qualifies for before spending anything — that is the decision a first-time grant writer most needs made, and it takes eligibility-checked matching, not keyword alerts, to make it well.
Sources and last verification
Every price on this page was read from the vendor’s own published pricing on the date shown. Vendors change pricing without notice — if something here is out of date, tell us at [email protected] and we will correct it.
- Grantboost published pricing — verified August 2026
- GrantSonar pricing