Tuta Mail (Tutao GmbH) sustainability score: 36/100
Better than 46% of SaaS / Digital Services
Making progress starts at 46. The highest score on SINK is 71.
Tuta Mail is an encrypted email and calendar service run by Tutao GmbH, a German software company based in Hanover with about 40 employees. It markets privacy and sustainability as core differentiators and runs its own servers on 100% renewable electricity.
Founded 2012Head office Hanover, GermanyStaff ~40Revenue Not disclosed (balance sheet total ~€3M, 2023, Implisense)Website ↗
Tuta operates on 100% renewable electricity since 2019 with minimal emissions and independent circular economy recognition. The critical weakness: no quantified targets, no GHG Protocol methodology, and unverified CO₂-neutral claims undermine credibility despite genuine resource-efficiency practices.
Tuta Mail (Tutao GmbH) scores 36/100 (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 October 2026.
That places Tuta Mail (Tutao GmbH) joint 542nd of 1,023 companies scored, and joint 36th of 69 in SaaS / Digital Services.
What is Tuta Mail (Tutao GmbH) doing well, and where does it fall short?
Strongest on Controversies & Red Flags and Energy Source (8/10, 7/10). Weakest on Emissions Trajectory and Targets & Commitments (2/10, 2/10).
Where Tuta Mail (Tutao GmbH) 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 specific targets with dates.
- 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 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 falling2/10No evidence its emissions are falling, not even from energy bills or mileage.
- How clean its energy is7/10Less than 90% of its energy shown to be renewable.
- Its effect on nature4/10Its effect on nature isn't measured or independently verified.
- How it uses materials and handles waste6/10No verified figures for reuse and recycling across the business.
- Its effect on water4/10No measured water footprint with reduction targets.
- Its climate targets2/10No specific targets with dates.
- How openly it reports4/10No dedicated sustainability role, board oversight or public report.
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 Tuta Mail (Tutao GmbH)'s SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleHas Tuta Mail (Tutao GmbH)'s score changed?
Tuta Mail (Tutao GmbH)'s score has been reviewed 2 times and currently stands where it started, at 36.
- 36 → 367 November 2026
Correction, 7 November 2026: removed an unsourced emissions figure. Score unchanged.
- Scored 3614 October 2026
Initial score 36 (score-company publish)
What evidence is Tuta Mail (Tutao GmbH)'s score based on?
9 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
44% of them were published by Tuta Mail (Tutao GmbH) itself; the rest come from independent sources.
“All Tuta servers are owned by us and hosted in highly secure German data centers”
“extends the lifetime of its servers through proactive maintenance and modular upgrades, significantly reducing electronic waste”
“Tuta runs its entire operation on 100% renewable energy”
“Target validation is carried out by SBTi Services, a wholly-owned subsidiary of the Science Based Targets initiative.”
“Tuta Mail has won the 'Deutscher Fairnesspreis' 2025 in the category 'Green Email and Hosting Provider'”
“This Friday we will join people around the world to demonstrate for a better future.”
“These allegations against Tuta, (formerly Tutanota), are false.”
If you believe a source has been misread or a newer version exists, submit a challenge.
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How does Tuta Mail (Tutao GmbH) compare with other saas / digital services companies?
Where Tuta Mail (Tutao GmbH) sits among saas / digital services peers.
Among the 69 major saas / digital services brands we've scored, Tuta Mail (Tutao GmbH) is tied =36th of 69, with 2 others.
Who scores higher in SaaS / Digital Services?
The 3 companies in the sector scoring nearest above Tuta Mail (Tutao GmbH).
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