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@swyx Newsletter on Substack United States
Not known. Estimate $2,000 to $14,900 for one dedicated send.
Open on Substack 2 to check How to reach them
average reach a post Substack publishes no view counts, so there is no reach figure here.
free subscribers 198,000 From Substack's own API. Read Sep 4, 2026.
posts every 2 days across 10 recent posts
last posted 3d ago Read Sep 4, 2026.
Recent post performance
Likes on their last 10 posts
Average likes68
LikesAverage
Aug 11, 2026 to Sep 3, 2026. Oldest to newest.
View post data10 posts
| Post | Date | Likes | Promotion flag |
|---|---|---|---|
| 🔬The BioAI Phase Shift - Matthew McPartlon & Neil Patil, Chai Discovery | 40 | Not flagged | |
| React for Agents: Astro Creator Brings Hooks to his Meta-Harness, Flue | 42 | Not flagged | |
| Frontier Model Cost and Open-Weights Popularity is Driving Demand for Model Routing | 60 | Not flagged | |
| The /wayfinder Skill: Navigating the “Fog of War” of Planning | 76 | Not flagged | |
| Simulation: the new Scaling Law — Joon Sung Park, Simile AI | 41 | Not flagged | |
| The Evolution of the Agent Harness | 164 | Not flagged | |
| 🔬“We have foundation models for language, not for physics” — Anima Anandkumar, Bren Professor of Computing | 38 | Not flagged | |
| Lovable CTO: The Future of SaaS Is Apps That Agents Can Use | 58 | Not flagged | |
| PRs NOT Welcome: How Top AI Open Source Projects Are Managing Thousands of Contributors | 65 | Not flagged | |
| GPT-6 Astra: an automated AI Engineer you can hire for <$6 an hour | 95 | Not flagged |
Can you sponsor them?
Not known. Nothing on record either way. Ask them directly.
Estimate $2,000 to $14,900 for one dedicated send
Ask them directly 198,000 subscribers x $10 to $75 per 1,000 subscribers (beehiiv, 29 May 2026). Benchmark: beehiiv, Newsletter sponsorship cost ↗. This is our arithmetic on a published benchmark, not a quote from the creator.
Specialised B2B lists often command more (beehiiv quotes $50 to $100+).
What we checked
21 checks, 10 passed, 2 to review
| ✓ | Metrics came from the platform | Every audience figure here is a value Substack's own API returned, never estimated or inferred. The price estimate is the one number we work out ourselves, and it is labelled and shows its arithmetic. | not published |
| ✓ | Enough recent posts to judge | 10 recent posts sampled (target 10). | not published |
| ✓ | Newsletter floor: ≥10,000 free subscribers and ≥20 median reactions | 198,000 free subscribers (Substack's own figure, not the author's claim), 59 median reactions across 10 recent issues. | required |
| – | Open rate | Nobody publishes a newsletter's open rate: not Substack, not the author. How many subscribers actually opened the email a sponsored slot sat in is unknown, and is not estimated here. The subscriber count is the size of the list, not the size of the audience. | not published |
| ✓ | A sponsored slot would reach the free list | 100% of recent issues go to the whole list, so a sponsored slot reaches the subscriber count shown. | integrity |
| ✓ | Tech / dev / software engineering | 11 distinct dev signals in the bio and post text: react, software, engineer, open source, computing, simulation. | required |
| ✓ | Not a gaming channel | No gaming signal in the text. Substack publishes no content category, so this is a text judgement. | required |
| ✓ | Not a hardware / gear channel | No hardware/gear pattern. | preference |
| ! | Target region (US / UK / EU / AU / NZ / SG) | This creator's profiles disagree on where they are: Substack says United States, X says United States, X says Singapore. One of them is wrong, so neither is treated as settled. | required |
| ! | Reactions plausible for the subscriber count | 59 median reactions against 198,000 free subscribers is 0.030%. Reaction rates run low on newsletters, but this is low even for that. The list may be far less active than its size suggests. | integrity |
| – | Average is not one viral outlier | No view counts on this platform. | not published |
| – | Comment volume matches the view counts | Comment counts were not returned for this account. | not published |
| – | Reach plausible for the audience count | No view counts on this platform. | not published |
| ✓ | Posted recently | Last post 4 day(s) ago. | preference |
| ✓ | Publishes on a regular schedule | Median 2.2 day(s) between posts; the 10 sampled posts span 23 days. | preference |
| – | Sampled posts are recent enough to compare | Too few dated posts with counts to test whether the sample is comparable. | not published |
| – | Same numbers from two endpoints of the same API | No post from this account appeared in both the search index and the profile feed, so there was nothing to cross-check. | not published |
| – | Verified against the platform's own published feed | Substack publishes no independent public feed to check the API's numbers against. YouTube is the only platform here where that second source exists. | not published |
| ✓ | An independent creator, not a company's own channel | Nothing marks this as a company-run channel: it is not a known company account, the name carries no corporate designation, and the bio is not written in a company's voice. | required |
| – | Same person confirmed on other platforms | No other public profile was linked from this account, so this record covers one platform only. | not published |
| – | Runs paid promotions (platform-declared) | Sponsorships shown for this creator are parsed from the text of their own post descriptions, so they are suspected rather than platform-confirmed. | not published |