Kit vs Substack: flat fee or 10% of your revenue?
Like beehiiv, Kit charges a flat monthly fee and takes 0% of your subscriptions. Substack takes 10% of everything you earn but has no flat fee. Which wins depends entirely on how much you make — here's the exact crossover.
Fees verified 2026-07-13 from official sources.
The core difference
| Platform | Platform fee | Cut of subscription revenue | Processing |
|---|---|---|---|
| Substack | $0/mo | 10% | Stripe 2.9% + $0.30 |
| Kit Creator | $39–$679/mo (by list size) | 0% | Stripe 2.9% + $0.30 |
Where Kit overtakes Substack (the crossover)
Kit is cheaper once your yearly paid revenue crosses ~10× Kit's yearly fee. Using Kit Creator's annual-billing rate (annual = 10 months) at each list size:
| List size | Kit Creator /yr* | Substack cheaper below | Kit cheaper above |
|---|---|---|---|
| 1,000 | ~$390 | < $3,900/yr revenue | > $3,900/yr |
| 5,000 | ~$890 | < $8,900/yr | > $8,900/yr |
| 10,000 | ~$1,390 | < $13,900/yr | > $13,900/yr |
| 25,000 | ~$1,990 | < $19,900/yr | > $19,900/yr |
*Kit Creator monthly rate × 10 (annual billing = 2 months free). Crossover ignores Stripe fees since both charge the same processing. Note: Kit's flat fees run higher than beehiiv's, so Kit's crossover sits a bit lower — but if you're comparing all three, beehiiv vs Substack is usually the cheaper flat-fee option.
When each wins
- Free or low-revenue newsletter: Substack ($0 unless you charge).
- Monetizing, automation-driven: Kit — 0% cut plus its automation and segmentation engine.
- Discovery matters most: Substack — its recommendation network and reader app can drive growth that offsets the 10%.
Check your exact numbers
Use the calculator for Kit's flat cost at your list size, then apply your paid-revenue figure against the crossover table. Want the full picture across all three platforms? See the complete pricing comparison.
Sources
Kit: Creator tier fees from kit.com pricing engine, 2026-07-13. Substack: 10% platform fee + Stripe 2.9%+$0.30 from official support docs, 2026-07-13.