Third Sphere’s Substack
Miela Mayer, Stonly Blue, Shaun AbrahamsonWorking for founders transforming global systems. Cross posting with https://medium.com/third-sphere See our newsletter here: https://thirdsphere.com/updates/
| Platform |  | Pricing | Only free issues | Publishes | Weekly |
|---|---|---|---|---|---|
| Issues | 9 | Founded | a year ago | Last Issue | 6 months ago |
| Active | |||||
Read this Newsletter
thirdsphere.substack.comLatest Issues
Why We Invested in Focal - Electrifying Heating One Person at a Time
“Part of Focal’s mission is to limit energy use. We spend too much money heating entire spaces, especially outside. This system heats people directly. It’s just a cleaner, smarter way to think about comfort.”
- Keith Cox | co-founde...
Speedstrap Playbook - Chapter 2
Living version of this Speedstrap Playbook here - comments welcome.
“Venture Capital doesn’t scale with more money.”
- Roelof Botha, October 2025 on Uncapped.
Playbook Table of Contents
Living version of this Speedstra...
Why We Invested in AccessGrid
When was the last time you thought about the plastic card or fob jangling on your keyring? Probably never. Yet those seemingly innocuous credentials represent a surprisingly stubborn problem: billions of PVC cards manufactured annually, mil...
SpeedStrap Playbook - Chapter 1
Working version of our extended Speedstrap Playbook here - this is a living document and comments are welcome.
“...my gut is we have a problem. The system as it exists today promotes less liquidity, less traditional, high quality c...
Paths to seedstrapping hardware startups
Using venture capital to outrun your competition sometimes works in the software world (and even then, rarely). But it’s an unproven strategy when working with hardware. The way that hardware companies grow is different - the first product...
Audience Metrics
Subscribers, engagement, traffic and sponsorship for Third Sphere’s Substack.
| Subscribers | Engagement | 67 | Monthly Web Visits | ||
|---|---|---|---|---|---|
| Accepts Sponsors | Estimated Cost per Ad | ||||
Explore More
Authors
The writers behind this newsletter.
Just a gal perusing and sense making | Climate Tech @Third Sphere | Into making things cooler
2 decades of very early stage tech investing (i.e. great demos with poor logos and no customers). Last decade focused on all things climate like Revivn, Near Space Labs, Kelvin, Onewheel, Applied Carbon, Cove Tool, Mill.
Frequently Asked Questions
How can I access the email archive for Third Sphere’s Substack?
You can find recent issues that have been published by Third Sphere’s Substack on Reletter by scrolling up to where it says Latest Issues. Tap on the link for any of the most recent emails or hit More Issues to see older ones.
How many subscribers does Third Sphere’s Substack have?
To see how many people subscribe to Third Sphere’s Substack, simply upgrade your Reletter account. We provide readership numbers and lots of other stats for this newsletter so you can decide if it's worth reaching out to.
How can I advertise in Third Sphere’s Substack?
Newsletter advertising can be extremely effective when it's done right. Before you pitch Third Sphere’s Substack as a potential sponsor or partner, make sure that you've done your research and checked its newsletter stats with Reletter.
Then, personalize one of our winning pitching templates and send it to the right person using the contact info provided.
How much does it cost to sponsor a publication like Third Sphere’s Substack?
Newsletter ad rates (or CPM) vary depending on many factors, including industry, number of subscribers, open rate, ad placement and more.
To find out how much an ad will cost, contact Third Sphere’s Substack using the contact information provided and ask for a copy of their media kit.
How can I find newsletters related to Third Sphere’s Substack?
Scroll up to where it says Related Newsletters to see other publications like Third Sphere’s Substack. You can also search our email newsletter directory to discover other newsletters that cover the topics you're interested in.
How do I contact Third Sphere’s Substack?
Reletter provides this newsletter's website URL above, where you will often find their contact information. We also provide links to associated social media accounts and pitching templates so you can reach out fast.