Wren Climate, PBC sustainability score: 38/100
Making progress starts at 46. The highest score on SINK is 71.
Limited independent evidence: only two independent sources cover this company. The score may change as more evidence appears.
Wren is a San Francisco-based SaaS platform enabling individuals to offset their carbon footprint by funding climate projects globally. Founded in 2019, it operates as a public benefit corporation with approximately 10–15 employees.
More about Wren Climate, PBC
The company curates and finances carbon removal and avoidance projects, primarily in reforestation, deforestation prevention, and soil carbon restoration.
Founded 2019Head office San Francisco, United StatesStaff ~10-15Revenue ~$5-6M (estimate; subscriber contributions)Website ↗
Wren is a carbon offset platform operating in a structurally contested market. Its own operational footprint is negligible, but it publishes no emissions data. Core weakness: zero formal disclosure of own operations, no SBTi commitment, and dependence on voluntary carbon credits with documented sector-wide integrity issues.
Wren Climate, PBC scores 38/100 (Below expectations) on SINK's independent climate assessment, scored from public data only. Scores are free. Nobody can pay to change a score, speed it up or hide it. Last verified July 2026.
That places Wren Climate, PBC joint 479th of 1,023 companies scored, and 31st of 69 in SaaS / Digital Services.
What is Wren Climate, PBC doing well, and where does it fall short?
Strongest on Transparency & Accountability and Controversies & Red Flags (7/10, 7/10). Weakest on Carbon Footprint: Operations and Carbon Footprint: Supply Chain (3/10, 3/10).
Where Wren Climate, PBC lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
What would raise this score
- Emissions from its own operationsPublish emissions figures for its own operations, even an estimate from energy bills.
- Emissions from its supply chainAssess where its supply-chain emissions come from.
- Whether its emissions are fallingShow its emissions are falling, even from energy bills or mileage.
Every question that lost points
- Emissions from its own operations3/10No emissions figures for its own operations, not even an estimate from energy bills.
- Emissions from its supply chain3/10No assessment of where its supply-chain emissions come from.
- Whether its emissions are falling3/10No evidence its emissions are falling, not even from energy bills or mileage.
- How clean its energy is3/10No renewable energy tariff or major efficiency investment shown.
- Its effect on nature6/10No verified restoration beyond its own footprint, or supply chain not mapped for nature risk.
- How it uses materials and handles waste5/10No measurable waste or recycling targets reported publicly.
- Its effect on water5/10No measured water footprint with reduction targets.
- Its climate targets5/10Its targets aren't science-based or committed to the Science Based Targets initiative.
- How openly it reports7/10No annual impact report, or no pay linked to climate targets.
- Its record on controversies7/10Points deducted for controversies or its business model. The finding is under question 10.
A score changes when the evidence does. We use new published evidence at the next rescore. Anyone can send us new evidence, free. How to send it.
How is Wren Climate, PBC's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleHas Wren Climate, PBC's score changed?
Wren Climate, PBC's score has moved from 54 to 38 across 2 recorded reviews, down 16 points.
- 54 → 38-167 November 2026
The small-company exception no longer applies: no revenue figure was found, and the only staff figure is from about 2020. With no published emissions figure, the 0.70x size step now applies.
- Scored 547 November 2026
Correction, 7 November 2026: removed an unsourced emissions figure. Score unchanged.
What evidence is Wren Climate, PBC's score based on?
9 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
78% of them were published by Wren Climate, PBC itself; the rest come from independent sources.
“Servers ($3,071): it costs some money to host our site”
“Wren subscribers made an incredible impact from June 2024-2025, contributing $4.9M”
“In year five, Wren subscribers have contributed $5.6M to fight climate change”
“We evaluate projects against 250+ indicators to ensure projects meet our standards”
“Wren is a registered PBC in the United States with a legally-binding charter”
“Wren's success as a business is measured by impact, not profit”
“Servers, software, and web expenses ($106,000)”
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How does Wren Climate, PBC compare with other saas / digital services companies?
Where Wren Climate, PBC sits among saas / digital services peers.
Among the 69 major saas / digital services brands we've scored, Wren Climate, PBC sits 31st of 69.
Who scores higher in SaaS / Digital Services?
The 3 companies in the sector scoring nearest above Wren Climate, PBC.
Microsoft's emissions rose 25% in FY2025 to 21.1 Mt CO2e, driven by data-centre construction: capital-goods emissions rose from 5.6 Mt to 9.0 Mt and Scope 3 is 86% of the total.
See the breakdown →Slack has no independent sustainability reporting; all environmental data is buried in parent Salesforce's consolidated metrics.
See the breakdown →Which companies moved this week, and why.
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