Plant-Based
Animal-Based
Synthetic &
Specialty &
FABRIC LIBRARY · ALWAYS FREE
Browse by fabric family.
Four families, 125 fabrics. Open any one for its sewing setup and care. Always free, no account.
Built by sewists, for sewists.
Know your fabric.Sew with confidence.
From choosing fabric to the final stitch, Sew Certain helps you turn ideas into projects you’ll love. Explore fabrics, match thread, compare sewing setups and find practical answers when something doesn’t go to plan. Created by sewists and sewing-machine specialists, it brings the guidance you need to the fabric aisle and your sewing table—even without Wi-Fi.
See what you can do
Three pages from the app you can use right now, no download. Open a fabric, put two side by side, or work out how much to buy.
125fabrics with 113 variants
245curated projects with patterns
400graphical references
START WHERE YOU ARE
What are you working on?
Start with the fabric, project or problem in front of you. Open a preview and have a look at what might help.
START WITH THE MATERIAL
“What is this fabric?”
You bought it because it was beautiful. Now find out what it is, which needle to use, and how to care for it before you cut.
Your next step
See the Find My Fabric options Choose a name search, bolt code, the fabric library or a few clues.
FROM THE PROJECT LIBRARY
Projects with patterns
245 projects, each with its pattern and the fabrics that suit it. Pick one you can’t wait to start; the pattern and the fabric notes come with it.
Curved stretch seams and a bound neckline, drafted to your measurements.
Open Color-panel training top project →
Knit bodice, ten-panel challis skirt, no zipper.
Open Color-panel maxi dress project →
48 squares, a walking foot and an afternoon or two.
Open Baby quilt project →
A fabric rabbit with a little pair of overalls.
Open Keepsake rabbit project →
Shirred back, tie shoulders, three tiers. No zipper.
Open Tie-shoulder sundress project →
Drawcord top, buckled flap and a faux-leather base.
Open Canvas backpack project →A REAL CHOICE FROM THE APP
Compare Denim and Canvas
Making a drop-shoulder chore jacket? Denim and Canvas are both Best main-fabric matches in the app. Compare the exact fabric versions, surface and sewing setup to choose the finish you want.
Two fabric options for your chore jacket
THE PROJECTDrop-shoulder chore jacket
Same pattern, two quite different jackets.
These are project guide matches from the app. Check the exact fabric, version, and pattern before choosing.
Open Match & Decide →THE FULL TOOLKIT
Sewing tools
Not sure which fabric to use, or how much to buy? These tools help you work through the details before you cut.
FIND MY FABRIC
Start with what you know.
Search a name, scan a Sew Certain bolt code, browse the library—or answer a few questions about the cloth in your hands.
These are real app screens. Clues suggest candidates; check them against your cloth. Tap any screen to enlarge.
MATCH & DECIDE
Same project. Different fabric.
Try Linen vs. Shirting Cottons →Could cotton replace your linen?
The app rates Shirting Cottons a Good substitute for Linen for lightweight shirts, dresses and soft tailoring. The surface, feel and care still matter.
Find an alternative, then compare
Start with one fabric to see ranked alternatives. Open a suggestion—or choose your own second fabric—to compare structure, sewing setup and care.
Shown: an excerpt from the app’s Structure view. Open the comparison to explore all three views and the available fabric versions.
Explore this comparison →
FABRIC IMPACT
See more than sewing and care.
Every fabric’s Impact tab gives it two scores, Eco and Sustainability, explains the reasons, and names lower-impact options where there are any.
Eco looks at what it takes to make the material. Sustainability looks at how long it lasts, how it is cared for and what happens to it afterwards. Both run 1 to 5 on the same chart, so you can see at a glance where a fabric does well and where it doesn’t.
Scores are guidance for the material and fabric version—not a certification of an individual bolt.
Explore the Impact chart →
Open the scrollable Impact page →
THREAD MATCHER588photographed thread shades
Match the color you choose.
Take Thread Matcher to the fabric store. Photograph your fabric, choose the color you want to match, and compare Metrosene and Gütermann suggestions with the spools in front of you. The downloaded app works offline.
Watch the step-by-step demo →
SOMETHING’S WRONG
SOMETHING’S WRONG87 sewing solutions.
Skipped stitches, puckering, a bird’s nest under the needle plate? Photos of what each fault looks like, the likely causes in order, and one thing to change at a time.
Try this page →
FABRIC CALCULATORS
Measure before you shop or cut.
Three calculators: yardage, quilt top, and quilt & binding. Work out fabric quantities for your project, with measurements in yards or metres.
Try the calculator →The rest of the toolkit
Projects with patterns, Sewing Mode, the two illustrated references, and the place your saved work lives.
FIND FABRIC FOR YOUR PROJECT
Begin with what you want to make.
Each project opens with its pattern, the fabrics that suit it, what to buy, the skill level and an honest guess at the hours.
Explore the project →
SEWING MODE
SEWING MODEKeep the next step beside your machine.
A checklist for the fabric you’re actually sewing, one step at a time, big enough to read from the chair. Tick steps off as you go.
Try the sewing checklist →
TEXTILE REFERENCE
TEXTILE REFERENCE302textile reference entries
Understand what fabric does.
302 entries on fibers, weaves, knits, finishes and how cloth behaves, down to the new bio-based materials. Each one comes with a drawing of the thing you would actually see or feel.
Try this page →
SEWING REFERENCE
SEWING REFERENCE72illustrated sewing lessons
Refresh a technique or machine setup.
72 illustrated lessons: needles, thread, stitches, seams, edge finishes and looking after the machine. For the ten minutes before you sew when you can’t quite remember.
Try this page →
MY STUFF
MY STUFFSaved projects and notes
Your saved fabrics, projects, comparisons and calculations, kept on your device. Pick up where you stopped.
Try this page →
FABRIC OF THE DAY
Fabric of the Day
One fabric a day and one thing worth knowing about it. Turn on weather matching and the pick suits the weather outside your window.
Weather matching needs location permission and a connection.
SEE WHAT’S INSIDE
Illustrated sewing guides
Some things are easier to understand when you can see them. Tap one to see how a bobbin case sits in its hook, or what five stitch faults look like in cross-section.
Explore more pages from the app →
120Techniques and LessonsIncluded with Pro.
FREE VS PRO
Library is always free.
The tools are Pro.
Start with the free fabric library. Choose Pro at launch for patterns, fabric comparisons, thread matching, calculators, illustrated references and your saved workspace.
Free library. More with Pro.
Compare every feature — Free vs Pro
Invited beta testers can try all tools for free. At launch, Free also includes three complete result unlocks shared across Match & Decide, Thread Matcher and project fabric recommendations.
Explore the fabric library at your own pace. No account or subscription needed.
$39.99 annual renewal.
Founder offer. Regular lifetime: $149.99.
One payment for ongoing Pro access.
That is 245 patterns for one payment, before the matching tools, calculators and references.
Pro pricing applies at launch; purchases are not open yet. Invited beta testers can try all tools for free. Final iOS prices, renewal terms and any trial details will appear in the App Store purchase flow. Android pricing will be confirmed when its app is ready.
TAKE IT TO YOUR SEWING TABLE
Where to get Sew Certain
Coming soon for iPhone, iPad and Android. We’ll put the download links right here as each app becomes available.
iPhone & iPad
The fabric library, Thread Matcher, patterns and guides, in your pocket in the fabric aisle and propped up beside your machine.
Get launch updates →Android
Same app, same content, on your Android device. We’ll put the download link here when it’s ready.
Get launch updates →More room for your sewing research. Pro web access is planned for version 1.1, so you can explore fabrics and print patterns on a bigger screen. Included with verified app-store Pro, with no second subscription. See what’s coming →
GOOD TO KNOW
Common questions
What can I use for free?
Browse and search the fabric library without an account or subscription. Patterns, project guidance and the other tools belong to Pro at launch. The website previews are free to explore now.
What does Pro include at the iOS launch?
Pro brings patterns, fabric comparisons, thread matching, calculators, illustrated references and project tools to the iPhone and iPad app. Purchases are not open yet. Full web access and cross-platform membership are a later phase; they are not included as available launch features.
Do I need a Sew Certain account?
No. The first app release works without a Sew Certain account, and your saved work stays on your device. Optional sign-in and sync are planned for version 1.1. The beta invitation form uses Google sign-in separately; joining the list does not create an app account.
Will my saved projects move between devices?
Not in the first release. Saved projects, photos, notes and sewing progress stay on the device where you create them. Optional sync is planned for version 1.1; it is not active at launch.
Can I use Thread Matcher in a store without Wi-Fi?
Yes. Once the app and its content are downloaded, Thread Matcher compares your photo with its thread catalog on your device. Fabric and sewing guidance work offline too—no Wi-Fi or mobile data needed for those tools. Downloading the app and updates, making or restoring purchases, and optional weather suggestions need an internet connection.
Who makes Sew Certain?
A small group of sewists who got tired of not finding the answer. We draw on research and sewing experience, reviewing and revising as we go. AI helps with some drawings and first drafts. More on the About page →
When are iOS, Android and web access coming?
The iPhone, iPad and Android apps are coming soon. We’ll update this page with download links as each becomes available. Join the list for launch news. Pro web access is planned for version 1.1.
KEEP IN TOUCH
Try Sew Certain
That’s the tour. The previews are free to poke around in. If you’d like to know when the app is out on iPhone, iPad or Android, leave your email and we’ll tell you.