Flowletter vs Substack
Flowletter
WordPress-integrated newsletter platform for publishers using Leaky Paywall subscription models
Publishers using it: 5 · incl. Mexico News Daily, The Fisherman, Salem Reporter
Last verified Nov 12, 2026
At a glance
- Flowletter scores 3.6/5 and Substack scores 3.6/5 in Benchmark Grid's independent email newsletter platforms benchmark, both assessed on the same 10 criteria.
- The widest gaps are audience growth tools (Flowletter 1.8, Substack 4.6) and deliverability & inbox placement (Flowletter 2.0, Substack 4.2).
- Both are built for small and mid-market publishers.
- On total cost of ownership Flowletter scores 3.7 and Substack 3.5 (higher means better value, not a lower price).
- In our tracking 5 publishers use Flowletter and 21 use Substack.
- Scores last verified 12 Nov 2026. Vendors cannot pay for a score or a position.
Where they differ
Substack is stronger on audience growth tools (4.6 vs 1.8), deliverability & inbox placement (4.2 vs 2.0), sending performance at scale (4.0 vs 2.3) and analytics after Apple Mail Privacy Protection (3.0 vs 1.5).
Which one fits
Choose Flowletter if…
- You publish at small and mid-market scale.
- You weight segmentation & automation, integrations & API and editor & template design heavily — Flowletter leads on those in this benchmark.
Choose Substack if…
- You publish at small and mid-market scale.
- You weight audience growth tools, deliverability & inbox placement and sending performance at scale heavily — Substack leads on those in this benchmark.
Also weighing these
The nearest-scored tools to Flowletter and Substack in this benchmark, listed A to Z.
- 4.2beehiivThe newsletter-first operating system for modern media brands, creators, and digital publishers.Read review
- 3.1Campaign MonitorProfessional email marketing and automation platform featuring designer-grade templates and visual journeysRead review
- 3.8LetterheadMake it. Measure it. Improve it.Read review
- 3.9PostUpEmail marketing and audience development platform purpose-built for media companies and digital publishers. Now operating independently as PostUp LLC following its divestiture from Upland Software.Read review
All 7 scored tools are in Best Email Newsletter Platforms.
Who uses them
Publishers we have detected running each tool, from ads.txt, site code and published case studies. Agencies, brands and vendors are excluded.
Head to head
| Criterion | Flowletter | Substack |
|---|---|---|
| Deliverability & inbox placement16% of capability | 2.0 | 4.2 |
| Audience growth tools12% of capability | 1.8 | 4.6 |
| Monetisation12% of capability | 4.0 | 4.7 |
| Segmentation & automation12% of capability | 3.0 | 1.5 |
| Analytics after Apple Mail Privacy Protection10% of capability | 1.5 | 3.0 |
| Editor & template design10% of capability | 3.0 | 2.0 |
| Integrations & API8% of capability | 2.5 | 1.2 |
| Subscriber management & data portability8% of capability | 4.5 | 4.0 |
| Compliance & list hygiene6% of capability | 2.5 | 3.5 |
| Sending performance at scale6% of capability | 2.3 | 4.0 |
| Capability45% of composite | 2.7 | 3.3 |
| Publisher fit40% of composite | 4.5 | 4.0 |
| Total cost of ownership15% of composite | 3.7 | 3.5 |
Cost of ownership
| Sub-score | Flowletter | Substack |
|---|---|---|
| Pricing transparency | 3.5 | 3.9 |
| Entry cost | 2.5 | 4.2 |
| Implementation cost | 4.5 | 4.2 |
| Hidden-fee risk | 4.2 | 3.0 |
| Ongoing cost | 3.8 | 2.2 |
Flowletter pricing
$199/month flat (single Flowletter plan); contact sales for higher send volumes.
Substack pricing
Free to publish; Substack takes a 10% commission on paid subscription revenue plus standard Stripe processing fees.
What users say
Flowletter
2 positive · 1 neutral · 0 negative
Substack
15 positive · 30 neutral · 9 negative
Mentions we could not tie to a real user, and those flagged as promotional, are excluded. Sentiment is opinion, and is independent of the verified publisher adoptions above.
Flowletter scores 3.6 and Substack scores 3.6 in Benchmark Grid's independent Best Email Newsletter Platforms benchmark (benchmarkgrid.com/vs/flowletter/substack, verified Nov 12, 2026)
Common questions
How do Flowletter and Substack differ?
Substack is stronger on audience growth tools (4.6 vs 1.8), deliverability & inbox placement (4.2 vs 2.0), sending performance at scale (4.0 vs 2.3) and analytics after Apple Mail Privacy Protection (3.0 vs 1.5). Neither is better in the abstract — which one suits you depends on which of those dimensions carries the most weight in your operation.
Which is cheaper, Flowletter or Substack?
On total cost of ownership — pricing transparency, entry cost, implementation, hidden-fee risk and ongoing cost — Flowletter scores 3.7/5 and Substack scores 3.5/5. A higher score means better value, not a lower sticker price.
How are these scores calculated?
Each tool is assessed against its category's published criteria (10 in this benchmark), which make up Capability (45% of the composite), Publisher fit (40%) and Total cost of ownership (15%). Assessment is carried out by SODP's editorial team against a published methodology. Vendors cannot pay for inclusion, scores or positions.
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Both tools are scored in Best Email Newsletter Platforms. See alternatives to Flowletter or alternatives to Substack.
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Where to next
Related comparisons
Other head-to-heads publishers look at in Best Email Newsletter Platforms.
