Flask

Lightweight Python web microframework. Flexible and widely taught; you assemble more pieces than with Django.

BSD-3-Clause · https://flask.palletsprojects.com

Frameworks & runtimes

Flask

Hosting: Self-hosted Reviewed

BSD-licensed; classic deploy on any Python host.

Fair 4.7
Easy 3.7
Secure 3.3

FES Scores 9

Pillar	Criterion	Score	Evidence
Easy	Day-one UX Can non-technical staff use it without a project?	4	Typical onboarding for this product category. Source
Easy	Operate Admin burden, updates, backups and language coverage.	3	You handle updates, backups and scaling. Source
Easy	Integrate SSO, mail/CalDAV, APIs and common NGO connectors.	4	Integrations vary; check current APIs and connectors. Source
Fair	Lock-in / exit Can you leave with your data in open formats, at known cost?	5	Rule baseline (rubric_v1): self-host + open-source path supports exit with your data. Source
Fair	Sovereignty EU legal entity, EU hosting, and exposure to extra-EU lawful access?	4	Rule baseline (rubric_v1): non-EU vendor; self-host still lets you pick EU infra — verify update/support exposure. Source
Fair	Openness Open source or open standards? Are independent implementations possible?	5	Rule baseline (rubric_v1): license classified as open-source family. Source
Secure	IT security Authentication, encryption, patch cadence and independent audit.	3	Security baseline depends on vendor posture and your configuration. Source
Secure	User security 2FA, roles, phishing resistance and safe defaults.	3	Account roles and MFA availability vary by plan. Source
Secure	Personal data GDPR fit: DPA, residency, sub-processors and Schrems II posture.	4	Review DPA, residency and subprocessors carefully. Source

Indicative scores from public information — how we score.