diff --git a/web/account/log-in-form.css b/web/account/log-in-form.css
index 9aa1dbe83..0f39f61e7 100644
--- a/web/account/log-in-form.css
+++ b/web/account/log-in-form.css
@@ -1,42 +1,49 @@
 div.modal_body {
   display: flex;
   flex-direction: column;
   padding: 20px 40px;
   border-radius: 16px;
   background-color: var(--modal-bg);
   box-shadow: 0 0 40px rgba(126, 87, 194, 0.5);
 }
 
 div.form_title {
   padding: 6px 6px 0 0;
   font-size: var(--s-font-14);
   font-weight: var(--bold);
   color: var(--fg);
 }
 
 div.form_content {
   margin-top: 4px;
   margin-bottom: 8px;
   font-family: var(--font-stack);
   color: var(--fg);
 }
 
 div.form_footer {
   display: flex;
   flex-direction: column;
   margin-top: 16px;
 }
 
 div.form_footer > button:disabled {
   min-height: 48px;
   opacity: 0.5;
 }
 
 div.modal_form_error {
   margin-top: 16px;
   font-size: 14px;
   color: var(--error);
   font-style: italic;
   padding-left: 6px;
   align-self: center;
 }
+
+div.ethereum_logo_container {
+  display: flex;
+  justify-content: center;
+  align-content: center;
+  margin: 0 4px;
+}
diff --git a/web/account/log-in-form.react.js b/web/account/log-in-form.react.js
index d078dcf96..aaa35b63e 100644
--- a/web/account/log-in-form.react.js
+++ b/web/account/log-in-form.react.js
@@ -1,218 +1,242 @@
 // @flow
 
 import '@rainbow-me/rainbowkit/dist/index.css';
 
 import {
   darkTheme,
   getDefaultWallets,
   RainbowKitProvider,
 } from '@rainbow-me/rainbowkit';
 import invariant from 'invariant';
 import _merge from 'lodash/fp/merge';
 import * as React from 'react';
+import { FaEthereum } from 'react-icons/fa';
 import { chain, configureChains, createClient, WagmiConfig } from 'wagmi';
 import { alchemyProvider } from 'wagmi/providers/alchemy';
 import { publicProvider } from 'wagmi/providers/public';
 
 import { logInActionTypes, logIn } from 'lib/actions/user-actions';
 import { useModalContext } from 'lib/components/modal-provider.react';
 import { createLoadingStatusSelector } from 'lib/selectors/loading-selectors';
 import {
   oldValidUsernameRegex,
   validEmailRegex,
 } from 'lib/shared/account-utils';
 import {
   type LogInExtraInfo,
   type LogInStartingPayload,
   logInActionSources,
 } from 'lib/types/account-types';
 import {
   useDispatchActionPromise,
   useServerCall,
 } from 'lib/utils/action-utils';
+import { isDev } from 'lib/utils/dev-utils.js';
 
 import Button from '../components/button.react';
 import LoadingIndicator from '../loading-indicator.react';
 import Input from '../modals/input.react';
 import { useSelector } from '../redux/redux-utils';
 import { webLogInExtraInfoSelector } from '../selectors/account-selectors';
 import css from './log-in-form.css';
 import PasswordInput from './password-input.react';
 
 // details can be found https://0.6.x.wagmi.sh/docs/providers/configuring-chains
 const availableProviders = process.env.COMM_ALCHEMY_KEY
   ? [alchemyProvider({ apiKey: process.env.COMM_ALCHEMY_KEY })]
   : [publicProvider()];
 const { chains, provider } = configureChains(
   [chain.mainnet],
   availableProviders,
 );
 
 const { connectors } = getDefaultWallets({
   appName: 'comm',
   chains,
 });
 
 const wagmiClient = createClient({
   autoConnect: true,
   connectors,
   provider,
 });
 
 const loadingStatusSelector = createLoadingStatusSelector(logInActionTypes);
 function LoginForm(): React.Node {
   const inputDisabled = useSelector(loadingStatusSelector) === 'loading';
   const loginExtraInfo = useSelector(webLogInExtraInfoSelector);
   const callLogIn = useServerCall(logIn);
   const dispatchActionPromise = useDispatchActionPromise();
   const modalContext = useModalContext();
 
   const [username, setUsername] = React.useState<string>('');
   const [password, setPassword] = React.useState<string>('');
   const [errorMessage, setErrorMessage] = React.useState<string>('');
 
   const usernameInputRef = React.useRef();
 
   React.useEffect(() => {
     usernameInputRef.current?.focus();
   }, []);
 
   const onUsernameChange = React.useCallback(e => {
     invariant(e.target instanceof HTMLInputElement, 'target not input');
     setUsername(e.target.value);
   }, []);
 
   const onUsernameBlur = React.useCallback(() => {
     setUsername(untrimmedUsername => untrimmedUsername.trim());
   }, []);
 
   const onPasswordChange = React.useCallback(e => {
     invariant(e.target instanceof HTMLInputElement, 'target not input');
     setPassword(e.target.value);
   }, []);
 
   const logInAction = React.useCallback(
     async (extraInfo: LogInExtraInfo) => {
       try {
         const result = await callLogIn({
           ...extraInfo,
           username,
           password,
           logInActionSource: logInActionSources.logInFromWebForm,
         });
         modalContext.popModal();
         return result;
       } catch (e) {
         setUsername('');
         setPassword('');
         if (e.message === 'invalid_credentials') {
           setErrorMessage('incorrect username or password');
         } else {
           setErrorMessage('unknown error');
         }
         usernameInputRef.current?.focus();
         throw e;
       }
     },
     [callLogIn, modalContext, password, username],
   );
 
   const onSubmit = React.useCallback(
     (event: SyntheticEvent<HTMLElement>) => {
       event.preventDefault();
 
       if (username.search(validEmailRegex) > -1) {
         setUsername('');
         setErrorMessage('usernames only, not emails');
         usernameInputRef.current?.focus();
         return;
       } else if (username.search(oldValidUsernameRegex) === -1) {
         setUsername('');
         setErrorMessage('alphanumeric usernames only');
         usernameInputRef.current?.focus();
         return;
       }
 
       const extraInfo = loginExtraInfo();
       dispatchActionPromise(
         logInActionTypes,
         logInAction(extraInfo),
         undefined,
         ({ calendarQuery: extraInfo.calendarQuery }: LogInStartingPayload),
       );
     },
     [dispatchActionPromise, logInAction, loginExtraInfo, username],
   );
 
   const loginButtonContent = React.useMemo(() => {
     if (inputDisabled) {
       return <LoadingIndicator status="loading" />;
     }
     return 'Log in';
   }, [inputDisabled]);
 
+  const siweButtonColor = React.useMemo(
+    () => ({ backgroundColor: 'white', color: 'black' }),
+    [],
+  );
+
+  let siweButton;
+  if (isDev) {
+    siweButton = (
+      <Button
+        onClick={undefined}
+        variant="filled"
+        buttonColor={siweButtonColor}
+      >
+        <div className={css.ethereum_logo_container}>
+          <FaEthereum />
+        </div>
+        Sign in with Ethereum
+      </Button>
+    );
+  }
+
   return (
     <div className={css.modal_body}>
       <form method="POST">
         <div>
           <div className={css.form_title}>Username</div>
           <div className={css.form_content}>
             <Input
               type="text"
               placeholder="Username"
               value={username}
               onChange={onUsernameChange}
               onBlur={onUsernameBlur}
               ref={usernameInputRef}
               disabled={inputDisabled}
             />
           </div>
         </div>
         <div>
           <div className={css.form_title}>Password</div>
           <div className={css.form_content}>
             <PasswordInput
               value={password}
               onChange={onPasswordChange}
               disabled={inputDisabled}
             />
           </div>
         </div>
         <div className={css.form_footer}>
           <Button
             variant="filled"
             type="submit"
             disabled={inputDisabled}
             onClick={onSubmit}
           >
             {loginButtonContent}
           </Button>
+          {siweButton}
           <div className={css.modal_form_error}>{errorMessage}</div>
         </div>
       </form>
     </div>
   );
 }
 
 function LoginFormWrapper(): React.Node {
   const theme = React.useMemo(() => {
     return _merge(darkTheme())({
       radii: {
         modal: 0,
         modalMobile: 0,
       },
       colors: {
         modalBackdrop: '#242529',
       },
     });
   }, []);
   return (
     <WagmiConfig client={wagmiClient}>
       <RainbowKitProvider chains={chains} theme={theme} modalSize="compact">
         <LoginForm />
       </RainbowKitProvider>
     </WagmiConfig>
   );
 }
 
 export default LoginFormWrapper;