Proton sustainability score: 27/100
Better than 16% of SaaS / Digital Services
Below expectations starts at 31. The highest score on SINK is 71.
Proton is a Swiss privacy-focused software company offering encrypted email, VPN, cloud storage and password-manager services, operated by Proton AG in Geneva. It runs its own data centres, and since June 2024 its primary shareholder has been the non-profit Proton Foundation.
More about Proton
It does not publish revenue.
Head office Plan-les-Ouates, SwitzerlandWebsite ↗
Proton publishes no emissions data, renewable energy figures or climate targets, although it runs data centres in Switzerland, Germany and Norway. Users on its feedback board have asked for a climate statement and plan without a public answer, and it publishes no environmental governance. Its only environmental claim found is an undated listing it supplied to an EU stakeholder platform, which says it uses 100% renewable energy but gives no figures.
Proton scores 27/100 (Significant gaps) 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 November 2026.
That places Proton joint 815th of 1,023 companies scored, and joint 57th of 69 in SaaS / Digital Services.
What is Proton doing well, and where does it fall short?
Strongest on Controversies & Red Flags and Energy Source (8/10, 3/10). Weakest on Emissions Trajectory and Targets & Commitments (1/10, 1/10).
Where Proton 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
- Whether its emissions are fallingShow its emissions are falling, even from energy bills or mileage.
- Its climate targetsSet emissions reduction targets.
- Emissions from its own operationsPublish emissions figures for its own operations, even an estimate from energy bills.
Every question that lost points
- Emissions from its own operations2/10No emissions figures for its own operations, not even an estimate from energy bills.
- Emissions from its supply chain2/10No assessment of where its supply-chain emissions come from.
- Whether its emissions are falling1/10No 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 nature2/10No assessment of its effect on nature, and no basic environmental policy.
- How it uses materials and handles waste2/10No active waste reduction, reuse or repair shown.
- Its effect on water3/10No monitoring of water use, or no measures to reduce it.
- Its climate targets1/10No emissions reduction targets.
- How openly it reports2/10No published sustainability data, or no one named as responsible for it.
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 Proton's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleHas Proton's score changed?
Proton's score has moved from 48 to 27 across 2 recorded reviews, down 21 points.
- 48 → 27-213 November 2026
Re-scored in agent mode 2026-11-03: sector SaaS / Digital Services from its own description (owner ruling 2026-11-03, PR #185); publishes no emissions, so 0.70x; 48 -> 27
- Scored 4822 August 2026
Initial score 48 (score-company publish)
What evidence is Proton's score based on?
9 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
33% of them were published by Proton itself; the rest come from independent sources.
“Our data centers are located in multiple countries (Switzerland, Germany, and Norway)”
“All of its sites comply with ISO 14001”
“Among commercial providers, Proton Mail is the most efficient”
“The company is also setting up locations in Norway.”
“Proton has also confirmed it's also developing facilities in Norway.”
“Are you planning on using renewable energy for your operations soon?”
“The newly established Proton Foundation will serve as the main shareholder to the existing corporate entity that is Proton AG”
“By bestowing the controlling stake in Proton to the foundation, the company is practically immune to the threat of a hostile takeover.”
“make the Proton Foundation the primary shareholder of Proton”
If you believe a source has been misread or a newer version exists, submit a challenge.
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How does Proton compare with other saas / digital services companies?
Where Proton sits among saas / digital services peers.
Among the 69 major saas / digital services brands we've scored, Proton is tied =57th of 69, with 1 other.
Who scores higher in SaaS / Digital Services?
The 3 companies in the sector scoring nearest above Proton.
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