Write a clearer first draft
“Draft a project update for my team. Explain the delay honestly and propose the next steps.”
Catholic AI · Start free
The world's first AI model trained to follow Catholic values
Synderesis is the first such system available to consumers: a complete, usable product — chat, apps and plans — not just released model weights, and not a wrapper or prompt layer over a general-purpose AI. The model itself is trained on thousands of teaching examples drawn from millions of words of Church teaching.
No card required · One-time free token allowance · €5/month to continue
Catholic by design
Privacy controls you can review
You review and decide
Created by Hasse Hällström and Oscar Andersson, through an independent EU company. Meet the people behind Synderesis.
Bring something you need to get done
Start with a question that matters to you.
Curious about AI, or still cautious? Try a small task, read the answer carefully and decide whether it helps.
Explore Church teaching
“Explain what the Church teaches about human dignity. Point me to official sources I can read for myself.”
Think through a decision
“Help me compare these options. Who would be affected, what are the trade-offs, and what do I still need to find out?”
Example requests to try in the workspace. Review AI output and verify important information.
“Technology is never neutral.”
Pope Leo XIV · Magnifica Humanitas (15 May 2026)
The foundation behind the tool
AI is shaped by human choices.
The people who build and use technology shape what it does. Synderesis makes its starting point clear: the Catholic faith, the dignity of every person and the responsibility we retain when using AI.
How answers are framed
It helps to ask which assumptions shape an answer. A Stanford working paper explores how users perceive political slant in AI responses. Read the paper.
Whose perspectives appear
Faith can be relevant to everyday questions. A research preprint examines how models represent different perspectives, including religious ones. Read the benchmark.
How values enter the design
People choose training material and give feedback on model answers. An AIES study examines the values involved in that feedback process. Read the study.
Why Synderesis
Useful AI, grounded in Catholic principles.
Synderesis is built for people and organisations who want practical help grounded in Catholic principles. AI should assist, never replace, human judgment.
Our design rule is simple: AI assists; people review and decide.
Catholic by design
Catholic principles shape the product. When a question calls for Church teaching, Synderesis can ground the answer in official Catholic sources.
Dignity before efficiency
Move routine work forward while keeping decisions about people with people.
Flexible deployment
For organisational work, talk to us about private-cloud and on-premise options where your data and duty of care call for tighter control.
Privacy you can inspect
We protect your sign-in details and let you delete your account. Read our Privacy & GDPR Notice.
An EU company
Synderesis is built and maintained by an independent EU company. Where your data is processed, and by which providers, is set out in our Privacy Notice.
People stay responsible
Synderesis can draft, answer and organise. You review the work—on your own or with a team—and remain responsible for the decision.
Help with everyday work. Responsibility stays with you.
Use Synderesis for personal drafting, research and questions—and for work across a team. Customer Agent, Platform and API options let organisations carry the same Catholic horizon into websites and systems.
✓Catholic principles stated openly
✓Answers and drafts for you to question, check and refine
✓A private workspace for individuals and professionals
✓Customer Agent, API and deployment paths for organisations
synderesis — an inner compass for recognising what is right and acting accordingly.
The idea behind our name
Choose your product
Synderesis Spark, Synderesis Pro, or Synderesis Labora.
Synderesis Spark is the default for fast conversation. Choose Synderesis Pro for deeper reasoning or Synderesis Labora for bounded work.
Synderesis SparkFast chat · Default
Provides quick, grounded conversation for everyday questions, summaries, and drafting.
Synderesis ProDeep reasoning
Uses deeper reasoning for demanding analysis, research, and drafting while keeping you in control.
Synderesis LaboraYour AI worker
Carries out bounded tasks through approved capabilities, with progress, review, and cancellation controls.
Choose where to start
One Catholic AI product. Three practical ways to use it.
The world's first AI model trained to follow Catholic values is a complete system you can use, not released weights alone and not a wrapper over a general-purpose AI. Start with the private workspace for your own writing, research and questions. Organisations can add a customer agent or bring Synderesis into their systems through the Platform and API. Whichever route you choose, Catholic principles, privacy and human review stay part of how it works.
Private workspace · Individuals & teams
Write, research and work through questions
Use Synderesis for yourself or in your professional work, with grounding in official Catholic sources when the task calls for it. Start on the free allocation; subscribe for €1 for your first subscription month, then €5/month.
Start freeCustomer agent
Answer routine questions. Hand over the human ones.
Give website visitors clear answers based on the products, policies and FAQs you approve, with escalation when a person should take over.
Explore the customer agentPlatform & API
Bring Synderesis into your operations
Every account can create account-scoped API keys with one shared allowance. Organisations with tighter requirements can talk to us about private-cloud or on-premise options.
Explore the platform & APIWho it's for
Catholic AI for your everyday life and work.
The world's first AI model trained to follow Catholic values, built for individuals and professionals as well as Catholic institutions and values-driven European organisations — a complete consumer system, not a wrapper over a general-purpose AI.
Private workspace
Individuals & professionals
Draft, research and work through questions with Catholic principles and human responsibility in view—whether you are joining for yourself or for your professional work.
Catholic institutions
Support diocesan, parish, school and charity administration, communication and knowledge work without treating Catholic principles or human review as optional.
Values-led businesses & public-interest teams
Bring AI into day-to-day operations without treating privacy or organisational principles as optional.
Schools & universities
Support administration, communication and research writing inside clear boundaries for staff, students and families.
Charities, healthcare & care organisations
Support administration and communication with explicit data and review boundaries. Clinical decisions remain with qualified professionals.
Get started
Start free today.
Create an account and start with a one-time free allowance — no card required. Subscribe for €1 for your first subscription month, then €5/month.
The free allocation is a one-time starting balance. Subscribing lifts it. Monthly credit reflects your payment after processor fees; your first subscription month also includes €4 promotional credit. The introductory offer is automatic for accounts with no previous paid subscription month, and does not apply to top-ups. Cancel any time, self-service, and keep access until the end of the paid period. Chrome extension connections open in a later release.
Three steps
- 1Create your account
Just your email and password. Start free without a card.
- 2Try real work
Draft, research and work through questions, with source-grounded answers when the task calls for it.
- 3Subscribe when ready
€1 for your first subscription month, then €5/month through Stripe Checkout, managed from your account. Cancel whenever.
Your next step
Ready to see whether Synderesis fits?
Joining for yourself or your professional work? Create a free account and try the workspace today. Evaluating Customer Agent or a private Platform deployment? Email us with your use case and data needs.
Start free · First subscription month €1, then €5/month · Built by an EU company · Independent EU company · hello@synderesis.eu