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Simon Willison’s Newsletter
@simonw Newsletter on Substack
Not known. Estimate $690 to $5,200 for one dedicated send.
Open on Substack 1 to check How to reach them
average reach a post Substack publishes no view counts, so there is no reach figure here.
free subscribers 69,000 From Substack's own API. Read Sep 4, 2026.
posts every 7 days across 10 recent posts
last posted 6d ago Read Sep 4, 2026.
Recent post performance
Likes on their last 10 posts
Average likes64
LikesAverage
Jun 26, 2026 to Aug 31, 2026. Oldest to newest.
View post data10 posts
| Post | Date | Likes | Promotion flag |
|---|---|---|---|
| Porting the Moebius 0.2B image inpainting model to run in the browser with Claude Code | 32 | Not flagged | |
| Have your agent record video demos of its work with shot-scraper video | 45 | Not flagged | |
| The new GPT-5.6 family: Luna, Terra, Sol | 57 | Not flagged | |
| Kimi K3, and what we can still learn from the pelican benchmark | 81 | Not flagged | |
| OpenAI’s accidental cyberattack against Hugging Face is science fiction that happened | 71 | Not flagged | |
| Stateless MCP has recaptured my interest | 79 | Not flagged | |
| Now we have a timeline of the OpenAI accidental attack against Hugging Face | 83 | Not flagged | |
| Qwen 3.8 27B is excellent, but it defaults to wildly overthinking things | 83 | Not flagged | |
| Conceptual integrity and counting lines of code | 43 | Not flagged | |
| Understanding ChatGPT Work | 69 | Not flagged |
Can you sponsor them?
Not known. Nothing on record either way. Ask them directly.
Estimate $690 to $5,200 for one dedicated send
Ask them directly 69,000 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, 11 passed, 1 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 | 69,000 free subscribers (Substack's own figure, not the author's claim), 70 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 | 8 distinct dev signals in the bio and post text: python, browser, database, sqlite, open source, llm. | 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 | 1 hardware mention(s), outweighed by 8 dev signals. | preference |
| ! | Target region (US / UK / EU / AU / NZ / SG) | This account has left its location field empty. Region is unknown and must not be claimed. | required |
| ✓ | Reactions plausible for the subscriber count | 70 median reactions against 69,000 free subscribers (0.10%). | 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 8 day(s) ago. | preference |
| ✓ | Publishes on a regular schedule | Median 7.1 day(s) between posts; the 10 sampled posts span 66 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 |