Grammarly vs Writesonic affiliate programs
Grammarly and Writesonic are AI writing tools that both run affiliate programs. Grammarly lists $0.20 per free signup + $20 per upgrade through Impact; Writesonic lists 20% of every payment your customer makes, every month, for up to 12 months through FirstPromoter. Grammarly lists the longer referral cookie: 90 days against 60. aifilliate records each program from a cited vendor source and does not rank the two.
| Recorded term | Grammarly Verified | Writesonic Verified |
|---|---|---|
| Commission | $0.20 per free signup + $20 per upgrade | 20% of every payment your customer makes, every month, for up to 12 months |
| Structure | One-time | Recurring |
| Cookie window | 90 days | 60 days |
| Network | Impact | FirstPromoter |
| Payout threshold | Not stated | Not stated |
| Terms checked | 2026-08-22 | 2026-08-21 |
| Source | Open source ↗ | Open source ↗ |
What matches, what differs
Differences
- Payout structure differs: one-time against recurring.
- Different platforms: Impact against FirstPromoter, meaning two dashboards and two payout schedules.
- Grammarly lists the longer referral cookie: 90 days against 60.
In common
- Both are AI writing tools.
What these terms mean in practice
Attribution splits between day 60 and day 90. A referral who clicks today and subscribes on day 75 is still credited by Grammarly, but no longer by Writesonic.
A customer who stays subscribed for two years pays out on every qualifying renewal with Writesonic, and once with Grammarly. Which produces more depends on plan price and retention, neither of which appears in published terms.
Promoting both means two applications, two dashboards, and two payout schedules — Impact for Grammarly and FirstPromoter for Writesonic, each with its own approval and its own minimum.
Which record fits which promoter
- Grammarly: suits traffic that deliberates before buying — the 90-day window still credits slow conversions.
- Writesonic: suits audiences that convert quickly; its 60-day window is shorter, so timing matters more.
What is not published
Anything below has to be confirmed with the vendor before either offer can be modelled. aifilliate records it as unknown rather than estimating it.
- Neither vendor publishes a payout threshold.
How to read these two records
These payouts do not share a basis — one is quoted as a percentage, the other as a flat amount per conversion. A percentage of an unknown plan price and a fixed bounty are not the same unit, so aifilliate does not rank them.
Grammarly pays one-time commission and Writesonic pays recurring, which typically matters more than the headline rate over a customer's lifetime. Grammarly lists the longer referral cookie: 90 days against 60.
aifilliate publishes no ranking between Grammarly and Writesonic. Which program earns more depends on plan price, conversion rate, retention, and refund reversals in your own audience — none of which appear in published affiliate terms. Confirm eligibility, paid-search and trademark rules, and payout timing with each vendor before promoting either.